Waltham Weather in September

Waltham in September averages 24°C (75°F) during the day and 12°C (54°F) at night. This is the driest month of the year.

Rainfall in Waltham in September

Conditions tend to be dry and settled, making it a good month for outdoor plans. Rain is expected on roughly 9 days, totalling around 83 mm (3.3 in) for the month. When showers do arrive, they tend to be on the heavier side. Worth being prepared even if rain days are not that numerous.

Temperature in Waltham in September

If you're visiting Waltham in September, expect excellent temperatures with highs of 24°C (75°F) and overnight lows of 12°C (54°F). This gives the month a fairly typical daily rhythm, with warmer afternoons and more comfortable nights. At 12°C (54°F) overnight, it can feel quite a bit cooler after dark. Worth packing something warmer for evenings, but the cooler temperatures are ideal for sleeping.

Sunshine in Waltham in September

The city usually sees around 238 hours of sunlight, indicating many sunny days , a great month for sightseeing.

Wind Speed in Waltham in September

September has wind speeds averaging 5 m/s (10 knots). You can expect gentle to moderate winds that move small trees and make flags wave steadily on typical days. Conditions typically range from light breezes to moderate winds.

Average water temperature in September

With water at 18°C (64°F), swimming is comfortable for most people. It feels refreshing rather than cold, though it depends a bit on personal preference.

Our weather planner can help you find worldwide destinations with pleasant weather during this period. May, August and September typically offer the best weather for Waltham.